Fedora Core 4 : krb5-1.4.1-5 (2005-553)
High Nessus Plugin ID 18685
SynopsisThe remote Fedora Core host is missing a security update.
DescriptionA double-free flaw was found in the krb5_recvauth() routine which may be triggered by a remote unauthenticated attacker. Fedora Core 4 contains checks within glibc that detect double-free flaws. Therefore, on Fedora Core 4, successful exploitation of this issue can only lead to a denial of service (KDC crash). The Common Vulnerabilities and Exposures project assigned the name CVE-2005-1689 to this issue.
Daniel Wachdorf discovered a single byte heap overflow in the krb5_unparse_name() function, part of krb5-libs. Successful exploitation of this flaw would lead to a denial of service (crash).
To trigger this flaw remotely, an attacker would need to have control of a kerberos realm that shares a cross-realm key with the target, making exploitation of this flaw unlikely. (CVE-2005-1175).
Daniel Wachdorf also discovered that in error conditions that may occur in response to correctly-formatted client requests, the Kerberos 5 KDC may attempt to free uninitialized memory. This could allow a remote attacker to cause a denial of service (KDC crash) (CVE-2005-1174).
Gaael Delalleau discovered an information disclosure issue in the way some telnet clients handle messages from a server. An attacker could construct a malicious telnet server that collects information from the environment of any victim who connects to it using the Kerberos-aware telnet client (CVE-2005-0488).
The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses the Kerberos-aware rcp to copy files from a malicious server (CVE-2004-0175).
Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected packages.